Rotary drier.



N. M. ROShNDAS-IL ROTARY 0mm x APPLICATION HLED NOV. 5. 1914- Patentml June 12, 191? ESHEETS-SHEET I.

N. M: ROSENDAHL.

ROT-ARY DRIER.

APPLICATION FILED NOV. 5, 1914- v fifi Y Patented'June 12,1917.

v 2 SHEETS-SHEET 2- I ulllllllh 5| my f 6 um l NILS M. BOSEINJDAHL, OF WIN'IHROP HARBOR, ILLINOIS, ASSIGNQIR- TO FREDERICK G. I I

AUSTIN, OF CHICAGO, ILLINOIS.

norms?! DRIER.

Specification of Letters Patent.

Patented June i2, 191?.

Application filed November 5, 1914. Serial No. 870,444.

To all whom it may concern:

Be it known that I, NrLs MHROSENDAHL, a citizen of the United States of America, and resident of Winthrop Harbor, Lake county, Illinois, residence address corner Whitney avenue and North Park avenue, have invented a certain new and useful Improvement in Rotary Driers, of which the following is a specification.

My invention relates to rotary driersfor use in machines for drying crushed rock, sand, gravel or other similar materials preparatory to combining the same with asphalt or other material. Generally stated, the object of my invention is to provide a novel and highly efiicient rotary drier of the foregoing general character. Special objects are to provide a novel construction and arrangement whereby the length of the rotary drum is reduced to a considerable extentwithout shortening or reducing the efliciency of the drying operation; to provide an improved construction and arrangement whereby the vapor and dust are drawn out of the drum by a current of air produced by a suction blower or similar draft producing means; and to provide certain details and features of construction and combinations tending to increase the general efliciency and Service ability of a rotary drier of this particular character.

To these and other useful ends my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings- Figure 1 is a longitudinal section of a rotary drier embodying the principles of my invention.

Fig. 2 is a cross section on line 2-2 in Fig. 1.

Fig. 3 is a vertical transverse section on line 3-3 in Fig. 1.

Fig. 4 is a rear end elevation of the drier shown in- Fig. 1. i

Fig. 5 is a vertical transverse section on line 5 5 in Fig. 1. j As thus illustrated, my invention comiprises a drum A arranged to rotate about a.

horizontally disposed a'xis;' Said drum is provided with a removable head B at its rear end, and with a removable head C at its forward end, the latter head or casting having an openin'g'c which forms the inlet for the materials. This head 0 is also provided with air inletopenings c and similar openings 7) are provided in the head B, the latter being also provided with outlets b for the materials, said outlet openings being arranged in a circle at the extreme outer,

edges of the said head. In addition the head B is provided with a central trunnion b that rests upon the rollers b of the hearing support 1), whereby the rear end of thedrum is supported by an idler bearing for rotation, whereby there is no transmission of power through the outer drum. The

' head C is provided with a similar trunnion c which rests upon the rollers c of the supporting bearing 0*, whereby the forward end of the drum is also supported for rotation. For this purpose, the trunnion 0 is tends and fits within the trunnion 0 being long enough to project-a distance into the opening 0 or inlet of the drum. Said cyllnder (Z is provided interiorly thereof'with a smaller concentric cylinder d whereby aspace a? is provided between these. two cyl- I inders, which space communicateswith the air outlet or suction pipe d lead ng'from the side of the casting. The space (2 1t W111 'be seen, communicates with the interior of is secured to t the drum, whereby air is drawn through the drum during its rotation, the said current of air entering through the openings 0 b and b in the-manner indicated by the arrows. A spider bearing (1* is secured to the lime! end of the cylinder d, which latter extends through a bearing cl at-the outer side of the casting. A s rocket d is secured to .the outer end of t is shaft, a sprocket d? 1s secured to the shaft 0 and a sprocket chain d connects these sprockets together, whereby the rotation of the shaft 0 by any suitable means, causes the shaft (Z and drum A to rotate. A s iral flange or screw 'feedd e shaft (F, in the cylindric feed chamber d, and the outer end of'this chamber is provided with ,a feed hopper ol." to which the materials are delivered by any suitable means. The arrangement is such that when the machine is in operation the said materials are fedv through! the chamfeed d and into the forward end of the "drum. Thusthe materials are forcibly fed.

into the drum, and at the same time an outgoing current of air 1s maintalned.

through the feed opening of the drum,-

- drum. The interior of the said drum is provided with means or instrumentalities for causing the materials to travel back and forth from one end of the drum to the other. The said instrumentalities include an inside cylinder E which has its forward end secured to the head or casting C and thus arranged in position to receive materials. This cylinder is provided internally with blades 0 which are set at an angle to propel the materials toward the rear end of the drum when the latter is rotated. A second cylinder F has its rear end secured to the head or casting B, this cylinder being arranged outside of the cylinder E, and thetwo cylinders and the drum being concentrically arranged relative to each other. The-cylinder F is provided with blades f which are set at an angle opposite to the angle of the blades 6, whereby the materials escaping from the rear end of the cylinder E are then caused to travel in the opposite direction by the blades f in the cylinder F, it being observed that this is in a direction opposite to the direction of travel of the air. The interior of the drum A is provided with similar blades a, these blades being set at the same angles as those of the blades 0, whereby the materials discharged from the front end of the cylinder F are then carried in the opposite direction by the blades a and caused to discharge from the drum through the openings 6 at the other end thereof. Thus the materials are caused to travel away from the axis of the drum in a zigzag manner, so

to speak, inasmuch as the direction of travel is not only gradually away from said axis, but is also parallel with said axis to a large extent. The general effect, therefore, so far as the drying of the materials is concerned, is practically the same as though the materials had been conducted through a rotary drum of substantially three times the length of the one shown and described; for by the time the materials have progressed from the feed opening to the discharge openings 6 of the drum a distance has been traversed which is only a little less than three times the length of the drum, in View of the fact that the materials have first traveled from one end to the other of the cylinder E, and then from one end to the other of the cylinder F, and finally from one end to the other of thesaid drum.

can be employed below the drum for heating the same, and within said housing, whereby the materials are heated while being tumbled about within the rotary drum. Also, it will be seen that by employing some sort of heating means below the drum, in the manner explained, the heated air and prodnets of combustion are drawn directly into the air by the suction apparatus previously described, thus causing all moisture to be carried out of the drum in the manner previously explained. With a rotary drier of the foregoing character the materials are thoroughly dried, and in addition the dust is thoroughly extracted, whereby the materials are-both dry and clean when finally discharged from the said spout.

The end walls 9 of the housing are disposed between the bearings c and'b and the ends of the drum. With this arrangement the heated air and products of combustion within the housing must enter the openings 0 and b and 6 but the bearings are outside and are not heated. Also, the bearing 0' is between the sprocket c and the end of the drum, and is thus outside of the housing and in position to receive power from the drive shaft 0 below. Thus the trunnion 0 forms the inlet of the drum for the materials, fits tightly around the fixed cylinder to exclude the air, and serves as means for rotating the drum. The trunnion 6 forms the closed end of the drum at the axis thereof.

This application covers an improvement on the drier shown and described and claimed in my prior application Serial No. 829,748, filed April 6, 1914. I

What I claim as my invention is 1. A rotary drier comprising a horizontally disposed drum, bearings for supporting said drum for rotation about a longitudinal axis, said drum having an axial inlet and peripheral outlet openings for the materials, instrumentalities within said drum for causing the materials to,travel back and forth from'one end of the drum to the other during the rotation thereof, a trunnion rigid with one end of said drum to support the latter on one of said bearings and forming an intake, for the'inlet opening, a device externally engaging said trunnion to rotate said drum, and rotary means engaging the other bearing to support and axially close the rear end of said drum, said instrumentalities including concentric cylinders attached respectively to opposite ends of said drum, causing the materials to travel away from said axis, a housing for inclosing said drum, said housing having end walls disposed between said bearings and the ends of said drum, the other end of each cylinder being unsupported.

2. A rotary driercomprlsing a horizon tally disposed drum, bearings for supportthe other bearing to support and axially close the rear end of said drum, said instrumentahties including concentric "cylm-,

\ ders attached respectively to opposite ends of said drum, causing the materials to travel 'away from said axis, a drive shaft below said trunnion, a connection between said device and saidshaft, one of said bearings be ing disposed between said 'device andlthe end of-said drum, the other end of each cylin; der being unsupported.

3. A rotary drier comprising oppositely arranged rotary heads, a cylindric imper'forate drum arranged horizontally and having its ends secured to said heads, concentrically arranged imperforate cylinders in said drum, securedendwise to said heads, devices to rotate one of said heads,'a plurality of longitudinal rows of feed platessecured to the inner surface of said ,drum, similar rows of feed plates secured to the inner surface of each cylinder, said plates being disposed at angles oblique to the length of each.

row, with spaces between adjacent rows, thereby to feed the materials back and forth in the direction of said rows, means to deliver the materials through said devices to one end of the inner cylinder, one head having outlets for the materials, and a suction connection associated with said means to draw air through said drum and cylinders. 4. A rotary drier comprising oppositely arranged rotary heads, a cylindric imperforate drum arranged horizontally and having its ends secured to said heads, concentrically -arranged imperforate cylinders in said drum, secured endwise to said heads, devices to'rotate one of said heads, a plurality of longitudinal rows of feed plates secured to the inner surface of said drum, similar rows of feed plates secured tothe inner surface of each cylinder, said plates being disposed at angles oblique to the length of each row, with spaces between adjacent "rows, thereby to feed the materials backand forth in the direction of said rows, means to deliver the. materials to one end'of the inner cylinder, one head having outlets for the materials, and a suction connection associated with said means to draw air through said devices from Leagues thereof; and whereby the cylinders can be untelescoped by merely disconnecting said heads. from the" drum.

5. Arotary drier comprising oppositely. arranged rotary heads, a'cylindric imperforate-drum arranged horizontally and having its'ends secured to said head's, concentrically arranged imperforate cylinders in said drum, secured endwise to said heads, devices to rotate one of said heads, a plurality of longitudinal rows .of feed plates secured to the inner surfacefof said drum, similar rows Of feed plates secured to the inner surface of each cylinder, said plates being disposed at angles oblique to the length of each row, with spaces between adjacent rows, thereby to feed the materials back and forth in the direction of said rows, means to deliver the one head havingoutlets for the materials, and a suction connection associatedvwith-said means to draw air through said drum and cylinders, said outlets and means being at 'materials to one end of the inner cylinder,

opposite ends of the. drum,and each cylinder being shorter than said drum. v

6. A machine for preparing materials, comprising a plurality of hollow members arranged one within theother, having imperforate' sides, means for rotating said members about a common axis, apparatus for sucking the dust and moisture laden air throughjsaid means from said members, meansat one end of the machine for feeding the materials-to the innermost member, an

members about a common axis, means at one end of the machine for feeding thematerials to the innermost member, an idler bearing for said member at the other end of said machine, means within the members for feeding the materials back and forth therein, from one member to the other, means for receiving the materials from the outermost member, said first-mentioned feeding means extending through said mechanism, means connected with said mechanism to drive-said first-mentioned feeding means, and a suction-connection to draw the air through said mechanism from said members, so that'the 'dust and moisture from the materials are sucked out through said mechanism'during the operation thereof.

8. A machine for preparing materials, comprising a plurality of hollow members arranged one within the other, having im- Ill) llfi

perforate sides, means for rotating said members about a common axis, means for feeding the materials to the innermost member, means Within the members for feeding the materials back and forth therein, from one member to the other, and'means for receiving the materials from the outermost member, the outer member being cylindric and provided with supporting heads at opposite ends thereof, and said last-mentioned feeding means consisting of rows of oblique blades extending parallel With said axis.

9. A machine for preparing materials, comprising a plurality of hollow cylindric members arranged concentrically one Within the other, having imperforate sides, mechanism for rotating said members about a common axis, means at one end of the machine for feeding the materials through said mechamsm to the innermost member, an

idler bearing for said member at the other end of said machine, means within the members for feeding the materials back and forth therein, from one member to the other, by the rotation of said members in unison, means for receiving the materials from the outermost member, means connected With said mechanism to drive said first-mentioned feeding means, the outermost member being supported at both ends thereof, and the inner members being each supported only at one end, the inner members being shorter than said outermost member.

- Signedby me at Chicago, Cook county, Illinois, this 17th day of October, 1914.

NILS M. ROSENDAHL.

Witnesses:

RACHEL J. RICHARDSON, ROSE E. SEHNEM. 

